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136 lines
3.2 KiB
136 lines
3.2 KiB
/* |
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* Copyright (c) 2020 Peter Johanson |
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* |
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* SPDX-License-Identifier: MIT |
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*/ |
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#define DT_DRV_COMPAT alps_ec11 |
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#include <device.h> |
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#include <drivers/gpio.h> |
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#include <sys/util.h> |
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#include <kernel.h> |
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#include <drivers/sensor.h> |
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#include <sys/__assert.h> |
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#include <logging/log.h> |
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#include "ec11.h" |
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LOG_MODULE_REGISTER(EC11, CONFIG_SENSOR_LOG_LEVEL); |
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static int ec11_get_ab_state(struct device *dev) |
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{ |
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struct ec11_data *drv_data = dev->driver_data; |
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const struct ec11_config *drv_cfg = dev->config_info; |
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return (gpio_pin_get(drv_data->a, drv_cfg->a_pin) << 1) | gpio_pin_get(drv_data->b, drv_cfg->b_pin); |
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} |
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static int ec11_sample_fetch(struct device *dev, enum sensor_channel chan) |
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{ |
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struct ec11_data *drv_data = dev->driver_data; |
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const struct ec11_config *drv_cfg = dev->config_info; |
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u8_t val; |
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s8_t delta; |
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__ASSERT_NO_MSG(chan == SENSOR_CHAN_ALL || chan == SENSOR_CHAN_ROTATION); |
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val = ec11_get_ab_state(dev); |
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LOG_DBG("prev: %d, new: %d", drv_data->ab_state, val); |
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switch(val | (drv_data->ab_state << 2)) { |
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case 0b0010: case 0b0100: case 0b1101: case 0b1011: |
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delta = 1; |
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break; |
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case 0b0001: case 0b0111: case 0b1110: case 0b1000: |
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delta = -1; |
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break; |
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default: |
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delta = 0; |
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break; |
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} |
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LOG_DBG("Delta: %d", delta); |
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drv_data->pulses += delta; |
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drv_data->ab_state = val; |
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drv_data->ticks = drv_data->pulses / drv_cfg->resolution; |
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drv_data->delta = delta; |
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drv_data->pulses %= drv_cfg->resolution; |
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return 0; |
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} |
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static int ec11_channel_get(struct device *dev, |
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enum sensor_channel chan, |
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struct sensor_value *val) |
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{ |
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struct ec11_data *drv_data = dev->driver_data; |
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if (chan != SENSOR_CHAN_ROTATION) { |
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return -ENOTSUP; |
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} |
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val->val1 = drv_data->ticks; |
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val->val2 = drv_data->delta; |
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return 0; |
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} |
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static const struct sensor_driver_api ec11_driver_api = { |
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#ifdef CONFIG_EC11_TRIGGER |
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.trigger_set = ec11_trigger_set, |
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#endif |
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.sample_fetch = ec11_sample_fetch, |
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.channel_get = ec11_channel_get, |
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}; |
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int ec11_init(struct device *dev) |
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{ |
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struct ec11_data *drv_data = dev->driver_data; |
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const struct ec11_config *drv_cfg = dev->config_info; |
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LOG_DBG("resolution %d", drv_cfg->resolution); |
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drv_data->a = device_get_binding(drv_cfg->a_label); |
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if (drv_data->a == NULL) { |
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LOG_ERR("Failed to get pointer to A GPIO device"); |
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return -EINVAL; |
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} |
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drv_data->b = device_get_binding(drv_cfg->b_label); |
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if (drv_data->b == NULL) { |
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LOG_ERR("Failed to get pointer to B GPIO device"); |
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return -EINVAL; |
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} |
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#ifdef CONFIG_EC11_TRIGGER |
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if (ec11_init_interrupt(dev) < 0) { |
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LOG_DBG("Failed to initialize interrupt!"); |
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return -EIO; |
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} |
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#endif |
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drv_data->ab_state = ec11_get_ab_state(dev); |
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return 0; |
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} |
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struct ec11_data ec11_data; |
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const struct ec11_config ec11_cfg = { |
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.a_label = DT_INST_GPIO_LABEL(0, a_gpios), |
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.a_pin = DT_INST_GPIO_PIN(0, a_gpios), |
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.a_flags = DT_INST_GPIO_FLAGS(0, a_gpios), |
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.b_label = DT_INST_GPIO_LABEL(0, b_gpios), |
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.b_pin = DT_INST_GPIO_PIN(0, b_gpios), |
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.b_flags = DT_INST_GPIO_FLAGS(0, b_gpios), |
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COND_CODE_0(DT_INST_NODE_HAS_PROP(0, resolution), (1), (DT_INST_PROP(0, resolution))), |
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}; |
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DEVICE_AND_API_INIT(ec11, DT_INST_LABEL(0), ec11_init, |
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&ec11_data, |
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&ec11_cfg, POST_KERNEL, CONFIG_SENSOR_INIT_PRIORITY, |
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&ec11_driver_api);
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